#include <stdio.h>

/*年龄几何*/

void main()
{
    int n,a,i;
    printf("The series with equal difference are:\n");
    for(n=1;n<=6;n++)
        for(a=1;a<=4;a++)
        if(4*n+6*a==26&&n*(n+a)*(n+a+a)*(n+a+a+a)==880)
        for(i=0;i<20;i++) printf("%d",n+1*a);
}
